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  <a class="post-header-title" href="/2022/03/06/%E8%A1%8C%E4%B8%9A%E6%8A%A5%E5%91%8A/JQuery/">jQuery</a>
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      发布于:&nbsp;2022-03-06
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    <h3 id="jQuery-如何获取元素"><a href="#jQuery-如何获取元素" class="headerlink" title="jQuery 如何获取元素"></a>jQuery 如何获取元素</h3><p><code>jQuery的基本设计思想和主要用法，就是&quot;选择某个网页元素，然后对其进行某种操作&quot;。这是它区别于其他Javascript库的根本特点</code> 。</p>
<p><code>使用jQuery的第一步，往往就是将一个选择表达式，放进构造函数jQuery()（简写为$），然后得到被选中的元素</code> 。</p>
<p><code>选择表达式可以是CSS选择器</code> ：</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line">$(document) //选择整个文档对象</span><br><span class="line"></span><br><span class="line">　　$(&#x27;#myId&#x27;) //选择ID为myId的网页元素</span><br><span class="line"></span><br><span class="line">　　$(&#x27;div.myClass&#x27;) // 选择class为myClass的div元素</span><br><span class="line"></span><br><span class="line">　　$(&#x27;input[name=first]&#x27;) // 选择name属性等于first的input元素</span><br></pre></td></tr></table></figure>

<p><code>也可以是jQuery特有的表达式</code> ：</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br></pre></td><td class="code"><pre><span class="line">$(&#x27;a:first&#x27;) //选择网页中第一个a元素</span><br><span class="line"></span><br><span class="line">　　$(&#x27;tr:odd&#x27;) //选择表格的奇数行</span><br><span class="line"></span><br><span class="line">　　$(&#x27;#myForm :input&#x27;) // 选择表单中的input元素</span><br><span class="line"></span><br><span class="line">　　$(&#x27;div:visible&#x27;) //选择可见的div元素</span><br><span class="line"></span><br><span class="line">　　$(&#x27;div:gt(2)&#x27;) // 选择所有的div元素，除了前三个</span><br><span class="line"></span><br><span class="line">　　$(&#x27;div:animated&#x27;) // 选择当前处于动画状态的div元素</span><br></pre></td></tr></table></figure>

<h3 id="jQuery-的链式操作是怎样的"><a href="#jQuery-的链式操作是怎样的" class="headerlink" title="jQuery 的链式操作是怎样的"></a>jQuery 的链式操作是怎样的</h3><p><code>就是最终选中网页元素以后，可以对它进行一系列操作，并且所有操作可以连接在一起，以链条的形式写出来，比如</code> ：</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line">$(&#x27;div&#x27;).find(&#x27;h3&#x27;).eq(2).html(&#x27;Hello&#x27;); </span><br><span class="line">分解开来，就是下面这样</span><br><span class="line"></span><br><span class="line">      $(&#x27;div&#x27;) //找到div元素</span><br><span class="line">      .find(&#x27;h3&#x27;) //选择其中的h3元素</span><br><span class="line">      .eq(2) //选择第3个h3元素</span><br><span class="line">      .html(&#x27;Hello&#x27;); //将它的内容改为Hello</span><br></pre></td></tr></table></figure>

<h3 id="jQuery-如何创建元素"><a href="#jQuery-如何创建元素" class="headerlink" title="jQuery 如何创建元素"></a>jQuery 如何创建元素</h3><p>创建新元素的方法非常简单，只要把新元素直接传入jQuery的构造函数就行了：</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line">$(&#x27;&lt;p&gt;Hello&lt;/p&gt;&#x27;);</span><br><span class="line"></span><br><span class="line">　　$(&#x27;&lt;li class=&quot;new&quot;&gt;new list item&lt;/li&gt;&#x27;); </span><br><span class="line"></span><br><span class="line">　　$(&#x27;ul&#x27;).append(&#x27;&lt;li&gt;list item&lt;/li&gt;&#x27;); </span><br></pre></td></tr></table></figure>

<p>jQuery 如何移动元素<br>jQuery提供两组方法，来操作元素在网页中的位置移动。一组方法是直接移动该元素，另一组方法是移动其他元素，使得目标元素达到我们想要的位置。</p>
<p>假定我们选中了一个div元素，需要把它移动到p元素后面。</p>
<p>第一种方法是使用.insertAfter()，把div元素移动p元素后面：</p>
<p>$(‘div’).insertAfter($(‘p’));<br>第二种方法是使用.after()，把p元素加到div元素前面：</p>
<p>$(‘p’).after($(‘div’)); </p>
<h3 id="jQuery-如何修改元素的属性"><a href="#jQuery-如何修改元素的属性" class="headerlink" title="jQuery 如何修改元素的属性"></a>jQuery 如何修改元素的属性</h3><figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line">$(&#x27;div&#x27;).has(&#x27;p&#x27;); // 选择包含p元素的div元素</span><br><span class="line"></span><br><span class="line">　　$(&#x27;div&#x27;).not(&#x27;.myClass&#x27;); //选择class不等于myClass的div元素</span><br><span class="line"></span><br><span class="line">　　$(&#x27;div&#x27;).filter(&#x27;.myClass&#x27;); //选择class等于myClass的div元素</span><br><span class="line"></span><br><span class="line">　　$(&#x27;div&#x27;).first(); //选择第1个div元素</span><br><span class="line"></span><br><span class="line">　　$(&#x27;div&#x27;).eq(5); //选择第6个div元素</span><br><span class="line"></span><br></pre></td></tr></table></figure>

<p> <code>有时候，我们需要从结果集出发，移动到附近的相关元素，jQuery也提供了在DOM树上的移动方法</code></p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line">$(&#x27;div&#x27;).next(&#x27;p&#x27;); //选择div元素后面的第一个p元素</span><br><span class="line"></span><br><span class="line">　　$(&#x27;div&#x27;).parent(); //选择div元素的父元素</span><br><span class="line"></span><br><span class="line">　　$(&#x27;div&#x27;).closest(&#x27;form&#x27;); //选择离div最近的那个form父元素</span><br><span class="line"></span><br><span class="line">　　$(&#x27;div&#x27;).children(); //选择div的所有子元素</span><br><span class="line"></span><br><span class="line">　　$(&#x27;div&#x27;).siblings(); //选择div的同级元素</span><br><span class="line"></span><br></pre></td></tr></table></figure>

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